The Beds Direct budget mattress is a great entry level budget mattress which is suitable for the occasional guest or use by smaller children. It has a soft/medium spring system and is approx 6" deep. Can be used on divan or slatted bases.
As with the vast majority of budget mattresses on the market it is designed for use by smaller children or as a temporary guestbed mattress for adults. If you are looking for a mattress suitable for every day adult use or just a better mattress for your child the perhaps consider the Prado mattress as a starting point.
Note: Fabric colour may vary from image